JP3165595B2 - Liquid crystal display element drive circuit - Google Patents
Liquid crystal display element drive circuitInfo
- Publication number
- JP3165595B2 JP3165595B2 JP19640394A JP19640394A JP3165595B2 JP 3165595 B2 JP3165595 B2 JP 3165595B2 JP 19640394 A JP19640394 A JP 19640394A JP 19640394 A JP19640394 A JP 19640394A JP 3165595 B2 JP3165595 B2 JP 3165595B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- voltage
- power supply
- driver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Liquid Crystal Display Device Control (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶表示素子駆動回
路、特に電池等の小型電源で時分割にて液晶表示を行う
小型機器の液晶駆動回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display element driving circuit, and more particularly to a liquid crystal driving circuit for a small device which performs liquid crystal display in a time division manner with a small power source such as a battery.
【０００２】[0002]
【従来の技術】液晶表示パネルにおける液晶表示は、セ
グメント信号にコモン信号を液晶表示素子に加えること
で点灯／非点灯を選択し表示しているが、点灯／非点灯
の電位差は微妙であり、表示内容などにより液晶表示駆
動用ＩＣに多くの電流が流れ電源供給用ＩＣからの供給
電圧が変動すると、点灯／非点灯のバランスが崩れ、コ
ントラストが悪くなり、表示品位が落ちてしまうことが
あった。2. Description of the Related Art In a liquid crystal display of a liquid crystal display panel, lighting / non-lighting is selected and displayed by adding a common signal to a liquid crystal display element as a segment signal, but the potential difference between lighting / non-lighting is delicate. If a large amount of current flows through the liquid crystal display driving IC depending on the display content and the supply voltage from the power supply IC fluctuates, the balance of lighting / non-lighting is lost , the contrast is deteriorated, and the display quality is deteriorated. Was.
【０００３】上記のような技術を改善するため、第１の
従来例として、特開昭６１−２３５８２１号公報には、
その第２図に示すように、上記した所謂電源供給用ＩＣ
の電源電圧（第１電源）ＶDDを分割する５つの直列に接
続された抵抗素子の第１および第２の抵抗素子の接続点
と、第４および第５の接続点にコンデンサ（１０）を、
また、第３の抵抗素子の両端間にコンデンサ（１１）を
それぞれ接続した技術が開示されている。[0003] As a first conventional example, Japanese Patent Application Laid-Open No. 61-235821 discloses a technique for improving the above technique.
As shown in FIG. 2, the above-mentioned so-called power supply IC
A capacitor (10) is connected to the connection point of the first and second resistance elements of the five series-connected resistance elements that divide the power supply voltage (first power supply) V DD and the fourth and fifth connection points. ,
In addition, a technique is disclosed in which a capacitor (11) is connected between both ends of a third resistance element.
【０００４】また、第２の従来例として、上記電源電圧
ＶDDを分割する５つの直列に接続された抵抗素子のそれ
ぞれの接続間と電源のＧＮＤ（アース）間にコンデンサ
を接続することにより電圧レベルの安定を図るものが考
えられている。As a second conventional example, a capacitor is connected between each connection of five series-connected resistance elements for dividing the power supply voltage V DD and between GND (ground) of the power supply. Something that can stabilize the level is considered.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記第
１の従来例に記載されている技術内容では、５つの抵抗
素子が全て同じ値であればコンデンサ（１０）には３／
５ＶDDの電圧が加えられ、コンデンサ（１１）には１／
５ＶDDの電圧が加えられることになり、特にコンデンサ
（１０）にはコンデンサ（１１）と比較して高い電圧に
耐えるコンデンサが必要となりコンデンサ（１１）より
も大きな容量のコンデンサとなってしまう。さらに、通
常不使用時に液晶に直流電圧がかからないように電源を
切ると同時にコンデンサの電荷は放電されているので、
電源投入時にコンデンサ（１１）を充電するにはコンデ
ンサ（１０）のときより多くの電流が必要である。However, in the technical contents described in the first conventional example, if all the five resistance elements have the same value, 3 /
A voltage of 5 V DD is applied, and 1 /
A voltage of 5 V DD is applied. In particular, the capacitor (10) requires a capacitor that can withstand a higher voltage than the capacitor (11), resulting in a capacitor having a larger capacity than the capacitor (11). In addition, since the power is turned off at the same time as turning off the power so that no DC voltage is applied to the liquid crystal when not in use, the charge on the capacitor is discharged,
Charging the capacitor (11) at power-on requires more current than with the capacitor (10).
【０００６】また、第１の従来例のコンデンサの位置で
は、第１および第２の抵抗素子の接続点と、第４および
第５の抵抗素子の接続点間、第３の抵抗素子の両端間の
電圧安定が図れるのみである。Further, at the position of the capacitor of the first conventional example, between the connection point of the first and second resistance elements, between the connection point of the fourth and fifth resistance elements, and between both ends of the third resistance element. Only voltage stabilization can be achieved.
【０００７】第２の従来例に記載されている技術内容で
は、第１の従来例よりも更に高い電圧がコンデンサに加
えられることになる。また、第２の従来例の場合はコン
デンサの数も多く必要であり、このコンデンサの位置で
はＧＮＤとの電圧安定が図れるのみである。In the technical content described in the second conventional example, a higher voltage is applied to the capacitor than in the first conventional example. Further, in the case of the second conventional example, the number of capacitors is also required to be large, and only the voltage stability with respect to GND can be achieved at the position of this capacitor.
【０００８】即ち、上記第１、第２の従来例の技術内容
では、それぞれコンデンサに耐圧電圧の高いものが要求
され外形が大きくなり、小型化、製造コスト、小電力化
に難がある。更に、第２の従来例では高負荷になると電
圧が変動してしまいコントラストが悪化する傾向があっ
た。Namely, the first, the technical content of the second conventional example, are required to have a high withstand voltage to a capacitor each contour increases, miniaturization, manufacture cost, a difficulty in a small power consumption. Further, in the second conventional example, when the load becomes high, the voltage fluctuates and the contrast tends to deteriorate.
【０００９】[0009]
【課題を解決するための手段】本発明は、上記のような
従来の課題を解決することを目的とするためのもので、
第１抵抗素子ないし第５抵抗素子を直列接続すること
で、各抵抗素子の接続点からを含め６レベルの電圧を発
生させる電源供給用ＩＣと、コモンドライバーと、セグ
メントドライバーと、液晶表示パネルと、ＣＰＵとを備
え、前記電源供給用ＩＣより前記コモンドライバーおよ
びセグメントドライバーにそれぞれ所望の電圧を供給
し、前記ＣＰＵより前記コモンドライバーおよびセグメ
ントドライバーに表示情報信号を供給し、前記コモンド
ライバーより前記液晶表示パネルにコモン信号を供給
し、前記セグメントドライバーより前記液晶表示パネル
にセグメント信号を供給することで液晶表示を制御する
液晶表示素子駆動回路において、前記電源供給用ＩＣ
は、前記第１抵抗素子ないし第５抵抗素子中の第２抵抗
素子および第４抵抗素子の２つの抵抗素子に対して、そ
れぞれ並列に同一容量のコンデンサを接続し、前記コモ
ンドライバーおよびセグメントドライバーに所望レベル
の電圧を安定供給してなるものである。さらに、前記電
源供給用ＩＣは、電源電圧とＧＮＤ間にも前記第２抵抗
素子と第４抵抗素子に対してそれぞれ並列に接続したコ
ンデンサとは容量が異なる平滑用のコンデンサを接続
し、非点灯時に供給される電位差を一定にするものであ
る。 Means for Solving the Problems The present invention is for an object to solve the conventional problems as described above,
Connecting the first to fifth resistance elements in series
Generates 6 levels of voltage including the connection point of each resistance element.
Power supply IC, common driver and seg
Hardware, a liquid crystal display panel, and a CPU.
For example, the respective supplies a desired voltage from the power supply IC to the common driver and segment driver supplies a display information signal to the common driver and segment driver than the CPU, common to the liquid crystal display panel from the common driver supplying a signal, in <br/> liquid crystal display element driving circuit for controlling the liquid crystal display by supplying a segment signal from the segment driver in the liquid crystal display panel, the power supply IC
With respect to two resistance elements of the first to fifth resistance elements, namely, the second resistance element and the fourth resistance element.
A capacitor of the same capacitance and connected to respectively parallel, in which before Symbol common driver and segment driver becomes stable provide the desired level of voltage. In addition, the
The power supply IC includes the second resistor between the power supply voltage and GND.
The element connected in parallel to the element and the fourth resistance element
Connect a smoothing capacitor with a different capacity than the capacitor
And makes the potential difference supplied during non-lighting constant.
You.
【００１０】[0010]
【作用】本発明による液晶表示素子駆動回路は、上記構
成とすることで、特に液晶パネルに実際に加わっている
電源間にコンデンサを入れることにより一層の安定化が
行なえ、表示のにじみやムラを抑え、コントラストのア
ップが図れる。The liquid crystal display device driving circuit according to the action of the present invention, by the upper Ki構 <br/> formed, it can do further stabilized by particularly placing a capacitor between the power source that actually applied to the liquid crystal panel, suppressing bleeding or unevenness in display, thereby the a <br/>-up of contrast.
【００１１】[0011]
【実施例】以下に、本発明における液晶表示素子駆動回
路を図面を用いて説明する。図１は、本発明における液
晶表示素子駆動回路の概略ブロック回路図である。６レ
ベルの電圧Ｖ1 ないしＶ6を発生する電源供給用ＩＣより
コモンドライバー２およびセグメントドライバー３にそ
れぞれ所望の電源電圧を供給し、ＣＰＵ（中央演算処理
装置）４より上記コモンドライバー２およびセグメント
ドライバー３に表示情報信号を供給する。上記コモンド
ライバー２で所望レベルの電源電圧と表示情報信号とで
表示波形を形成し、コモン信号としてＬＣＤ（液晶表示
パネル）５に供給し、またセグメントドライバー３で所
望レベルの電源電圧と表示情報信号とで表示波形を形成
しセグメント信号としてＬＣＤ５に供給して、このＬＣ
Ｄ５に目的の文字等を表示する。 EXAMPLES Hereinafter, the liquid crystal display element drive circuit of the present invention will be described with reference to FIG surface. FIG. 1 shows a liquid according to the present invention.
Ru schematic block circuit diagram der the crystal display element drive circuit. A desired power supply voltage is supplied to the common driver 2 and the segment driver 3 from a power supply IC that generates six levels of voltages V 1 to V 6 , respectively, and the common driver 2 and the segment driver are supplied from a CPU (Central Processing Unit) 4. 3 is supplied with a display information signal. The common driver 2 forms a display waveform with the desired level of the power supply voltage and the display information signal, supplies it to the LCD (liquid crystal display panel) 5 as a common signal, and the segment driver 3 generates the desired level of the power supply voltage and the display information signal. And a display waveform is formed and supplied to the LCD 5 as a segment signal.
To display the desired character such as the D 5.
【００１２】図２は、上記電源供給用ＩＣ１の抵抗分割
部分を示す回路図である。電源電圧Ｖddの第１電源とＧ
ＮＤ（アース）の第２電源間に、第１抵抗素子Ｒ1ない
し第５抵抗素子Ｒ 5 を直列接続し、各抵抗素子Ｒ1ないし
Ｒ5の接続点に、コモン非選択レベル電圧Ｖ2，セグメン
ト非選択レベル電圧Ｖ3，セグメント非選択レベル電圧
Ｖ4およびコモン非選択レベル電圧Ｖ5を得る。[0012] Figure 2, Ru circuit diagram illustrating a resistance division portion of the power supply IC1. First power supply of power supply voltage Vdd and G
Between the second power of ND (ground), a first resistance element R 1 to fifth resistive element R 5 is connected in series to a connection point of the resistance elements R 1 to R 5, the common non-selection level voltage V 2, The segment non-selection level voltage V 3 , the segment non-selection level voltage V 4 and the common non-selection level voltage V 5 are obtained.
【００１３】さらに、第２抵抗素子Ｒ2間の電圧Ｖ2とＶ
3間，第４抵抗素子Ｒ4間の電圧Ｖ4とＶ5間の電圧を安定
させるために、第２抵抗素子Ｒ2，Ｒ4間のそれぞれに１
０μＦ〜３０μＦ程度の同一容量のコンデンサＣ2，Ｃ4
を上記電源供給用ＩＣ１の外付けとして並列に接続し、
また、第１抵抗素子Ｒ1，第５抵抗素子Ｒ5の両端間、す
なわち電源電圧ＶddとＧＮＤ間に１μＦ程度の平滑用の
コンデンサＣdを接続して非点灯時に供給される電位差
を一定にする。Further, the voltages V 2 and V between the second resistance elements R 2 are
Between 3, in order to stabilize the voltage between the voltage V 4 and V 5 between the fourth resistance element R 4, respectively between the second resistive element R 2, R 4 1
Capacitors C 2 and C 4 having the same capacitance of about 0 μF to 30 μF
Are connected in parallel as an external part of the power supply IC 1,
The first resistive element R 1, across the fifth resistor element R 5, that is, the potential difference supplied at the time of non-illumination by connecting a capacitor C d for 1μF about smoothing between the supply voltage and V dd to GND constant To
【００１４】上記のような構成の電源供給用ＩＣ１に電
圧安定用のコンデンサＣ2，Ｃ4およびＣdを挿入しない
場合の各電圧波形、セグメント信号波形、コモン信号波
形およびＬＣＤ駆動波形を図３に、またコンデンサ
Ｃ2，Ｃ4およびＣdを挿入した場合の各電圧波形，セグ
メント信号波形，コモン信号波形およびＬＣＤ駆動波形
を図４に示す。FIG. 3 shows voltage waveforms , segment signal waveforms , common signal waveforms, and LCD drive waveforms when no voltage stabilizing capacitors C 2 , C 4 and C d are inserted into the power supply IC 1 having the above configuration. FIG. 4 shows voltage waveforms, segment signal waveforms, common signal waveforms and LCD drive waveforms when capacitors C 2 , C 4 and C d are inserted.
【００１５】図３の、コンデンサが挿入されていない場
合において、（ａ）は電源供給用ＩＣ１からコモンドラ
イバー２およびセグメントドライバー３に供給される電
圧Ｖ 1ないしＶ 6の波形で、電圧Ｖ 1ないしＶ 5は所望の平
均電圧値を有しているが脈流であり、電圧Ｖ 6はアース
電位の零（０）電圧である。（ｂ）はセグメント信号の
波形で、上記電圧Ｖ 1，Ｖ 3およびＶ 4の電圧レベルに脈
流が混入している。また、（ｃ）はコモン信号の波形
で、上記電圧Ｖ 1，Ｖ 2 およびＶ 5の電圧レベルに脈流が
混入している。（ｄ）は上記（ｂ）と（ｃ）を合成し
た、液晶パネル５を駆動する駆動信号の波形で、Ａ部で
は１９．２ｖ−１７．６ｖ間の電位差、Ｂ部では２０．
０ｖ−０ｖ間の電位差、Ｃ部では３．２ｖ−１．６ｖ間
の電位差が生じるが、変動した電圧となる。[0015] in FIG. 3, when the capacitor is not inserted, (a) shows the waveform of from voltages V 1 is supplied to the common driver 2 and segment driver 3 from the power supply IC1 V 6, to no voltages V 1 V 5 is to have but pulsating flow having a desired average voltage value, the voltage V 6 is zero (0) voltage of the ground potential. (B) is a waveform of a segment signal, and a pulsating flow is mixed in the voltage levels of the voltages V 1 , V 3 and V 4 . (C) is a waveform of the common signal, and a pulsating flow is mixed in the voltage levels of the voltages V 1 , V 2 and V 5 . (D) are synthesized above (b) and the (c), the waveform of the driving signal for driving the liquid crystal panel 5, the potential difference between 19.2V-17.6V in part A, the part B 20.
The potential difference between 0 v-0 v, 3 in C section. Although a potential difference between 2v-1.6v occurs, the voltage fluctuates.
【００１６】上記ＬＣＤ５は、セグメント−コモン端子
間に加わる電圧によつて点灯したり点灯しなかったりす
るが、その電圧が脈流により変動し、非点灯時にもかか
わらず、非点灯以上の電圧が加わることで薄く点灯す
る。図３の非点灯時の波形において、脈流により斜線部
のＡ部、Ｃ部の面積が大きくなることで薄く点灯する。
尚、液晶表示パネル５の点灯／非点灯はセグメント波形
により選択され、セグメント波形の点線部が点灯時には
波形として加わることになる。The LCD 5 is turned on or off depending on the voltage applied between the segment and the common terminal. However, the voltage fluctuates due to the pulsating flow, and the voltage is higher than the non-lighting even when the light is not turned on. Lights dimly by adding. In the waveform at the time of non-lighting in FIG. 3, the light is lightened because the area of the hatched portions A and C increases due to the pulsating flow.
Incidentally, the lighting / non-lighting of the liquid crystal display panel 5 is selected by the segment waveform, the dotted line portion of the segment waveform will be applied as a waveform at the time of lighting.
【００１７】次に図４の、コンデンサが挿入している場
合において、（ａ）は上記と同様に、電源供給用ＩＣ１
からコモンドライバー２およびセグメントドライバー３
に供給される電圧Ｖ 1ないしＶ 6の波形で、電圧Ｖ 1ない
しＶ 5は脈流のない所望の電圧値を有しており、電圧Ｖ 6
はアース電位の零（０）電圧である。（ｂ）はセグメン
ト信号の波形で、特に上記電圧Ｖ 3，Ｖ 4の電圧レベルに
は脈流が混入していない。また、（ｃ）はコモン信号の
波形で、特に上記電圧Ｖ 2，Ｖ 5の電圧レベルには脈流が
混入していない。（ｄ）は上記（ｂ）と（ｃ）を合成し
た、液晶パネル５を駆動する駆動信号の波形で、Ｄ部で
は上記と同様に１９．２ｖ−１７．６ｖ間の電位差、Ｅ
部では２０．０ｖ−０ｖ間の電位差、Ｆ部では３．２ｖ
−１．６ｖ間の電位差が生じるが、変動のない電圧とな
る。Next, when a capacitor is inserted as shown in FIG. 4, (a) shows a power supply IC 1 in the same manner as described above.
To common driver 2 and segment driver 3
It no voltages V 1 is supplied to the waveform of V 6, the V 5 and <br/> no voltages V 1 has a desired voltage value without pulsating, voltage V 6
Is a zero (0) voltage of the ground potential. (B) shows the waveform of the segment signal. In particular, no pulsating flow is mixed in the voltage levels of the voltages V 3 and V 4 . Also, (c) shows the waveform of the common signal. In particular, no pulsating flow is mixed in the voltage levels of the voltages V 2 and V 5 . (D) is a waveform of a driving signal for driving the liquid crystal panel 5 which is a combination of the above (b) and (c). In the D section, the potential difference between 19.2v-17.6v ,
The potential difference between 20.0V-0 v is in parts, 3.2 V in the F section
Although a potential difference between −1.6 V occurs, the voltage does not fluctuate.
【００１８】即ち、電源供給用ＩＣ１の第２抵抗素子Ｒ
2，第４抵抗素子Ｒ4に同一容量のコンデンサＣ2，Ｃ4を
並列に接続して、第２抵抗素子Ｒ2，第４抵抗素子Ｒ4に
て発生する非点灯時に供給される電位差を一定にするこ
とができる。尚、液晶表示パネル５の点灯／非点灯はセ
グメント信号の波形で選択される。That is, the second resistance element R of the power supply IC 1
2, a capacitor C 2, C 4 of the same capacity to the fourth resistive element R 4 connected in parallel, the second resistance element R 2, the potential difference supplied to the non-lighting time that occurs in the fourth resistor element R 4 Can be constant. The lighting / non-lighting of the liquid crystal display panel 5 is selected by the waveform of the segment signal.
【００１９】[0019]
【発明の効果】本発明によれば、液晶表示に影響の大き
な電圧レベル分割の第２、第４抵抗素子に並列に同一容
量のコンデンサを接続することにより、少ない数の低耐
圧コンデンサにて駆動電圧の変動を抑え、表示ムラを少
なくでき、表示品位の確保を可能とすることができる。According to the present invention, by connecting a capacitor of the same capacity in parallel to the second and fourth resistance elements of the voltage level division which greatly affects the liquid crystal display, it can be driven by a small number of low voltage capacitors. suppressing variation in voltage, can reduce the display unevenness, it is possible to enable secure display quality.
【図１】本発明における液晶表示素子駆動回路の概略ブ
ロック回路図である。1 is a schematic block circuit diagram of a liquid crystal display element driving circuit definitive to the present invention.
【図２】本発明における液晶表示素子駆動回路での電源
供給用ＩＣ内の抵抗分割部分の回路図である。FIG. 2 is a circuit diagram of a resistance dividing portion in a power supply IC in a liquid crystal display element driving circuit according to the present invention .
【図３】本発明における液晶表示素子駆動回路での電源
供給用ＩＣに電圧安定用のコンデンサを挿入しない場合
の各種電圧波形、セグメント信号波形、コモン信号波形
およびＬＣＤ駆動波形図である。FIG. 3 shows various voltage waveforms , segment signal waveforms , and common signal waveforms when a voltage stabilizing capacitor is not inserted into a power supply IC in a liquid crystal display element driving circuit according to the present invention .
And an LCD drive waveform.
【図４】本発明における液晶表示素子駆動回路での電源
供給用ＩＣに電圧安定用のコンデンサを挿入した場合の
各種電圧波形、セグメント信号波形、コモン信号波形お
よびＬＣＤ駆動波形図である。FIG. 4 shows a case where a voltage stabilizing capacitor is inserted into a power supply IC in a liquid crystal display element driving circuit according to the present invention .
Various voltage waveform segment signal waveform, our common signal waveform
FIG. 6 is a waveform diagram of an LCD and LCD driving.
１ 電源供給用ＩＣ ２ コモンドライバー ３ セグメントドライバー ４ ＣＰＵ（中央演算処理装置） ５ 液晶表示パネル DESCRIPTION OF SYMBOLS 1 Power supply IC 2 Common driver 3 Segment driver 4 CPU (Central processing unit) 5 Liquid crystal display panel
Claims (2)
接続することで、各抵抗素子の接続点からを含め６レベ
ルの電圧を発生させる電源供給用ＩＣと、コモンドライ
バーと、セグメントドライバーと、液晶表示パネルと、
ＣＰＵとを備え、 前記 電源供給用ＩＣより前記コモンドライバーおよびセ
グメントドライバーにそれぞれ所望の電圧を供給し、前
記ＣＰＵより前記コモンドライバーおよびセグメントド
ライバーに表示情報信号を供給し、前記コモンドライバ
ーより前記液晶表示パネルにコモン信号を供給し、前記
セグメントドライバーより前記液晶表示パネルにセグメ
ント信号を供給することで液晶表示を制御する液晶表示
素子駆動回路において、前記 電源供給用ＩＣは、前記第１抵抗素子ないし第５抵
抗素子中の第２抵抗素子および第４抵抗素子の２つの抵
抗素子に対して、それぞれ並列に同一容量のコンデンサ
を接続し、前記コモンドライバーおよびセグメントドラ
イバーに所望レベルの電圧を安定供給してなることを特
徴とする液晶表示素子駆動回路。A first resistance element to a fifth resistance element connected in series;
By connecting, 6 levels including from the connection point of each resistance element
Power supply IC that generates
Bar, segment driver, liquid crystal display panel,
Comprising a a CPU, respectively supplying a desired voltage to the common driver and segment driver from the power supply IC, before
Serial supplies display information signal to the common driver and segment driver from CPU, the supplies the common signal from the common driver to the liquid crystal display panel, and supplies a segment signal from the <br/> segment driver to the liquid crystal display panel in the liquid crystal display element driving circuit for controlling the liquid crystal display by the power supply IC has two resistors of the second resistor element and the fourth resistor element in said first resistive element to fifth resistive element
Capacitors of the same capacity are connected in parallel to the resistance elements
The liquid crystal display element driving circuit connected to, and characterized by being stable supply a desired level of voltage before Symbol common driver and segment driver a.
とＧＮＤ間にも前記第２抵抗素子と第４抵抗素子に対し
てそれぞれ並列に接続したコンデンサとは容量が異なる
平滑用のコンデンサを接続し、非点灯時に供給される電
位差を一定にすることを特徴とする請求項１記載の液晶
表示素子駆動回路。 2. The power supply IC further comprises a power supply voltage.
Between the second resistance element and the fourth resistance element between
Different from the capacitors connected in parallel
Connect a capacitor for smoothing and supply power when not lit.
2. The liquid crystal according to claim 1, wherein the position difference is constant.
Display element drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19640394A JP3165595B2 (en) | 1994-08-22 | 1994-08-22 | Liquid crystal display element drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19640394A JP3165595B2 (en) | 1994-08-22 | 1994-08-22 | Liquid crystal display element drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0862570A JPH0862570A (en) | 1996-03-08 |
| JP3165595B2 true JP3165595B2 (en) | 2001-05-14 |
Family
ID=16357288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19640394A Expired - Lifetime JP3165595B2 (en) | 1994-08-22 | 1994-08-22 | Liquid crystal display element drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3165595B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100472499B1 (en) * | 1998-05-28 | 2005-06-08 | 삼성에스디아이 주식회사 | Driving Method of Flat Panel |
-
1994
- 1994-08-22 JP JP19640394A patent/JP3165595B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0862570A (en) | 1996-03-08 |
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